For now, move Extensions to Renci.SshNet namespace.

src/Renci.SshNet.NET35/Common/Extensions.NET35.cs

@@ -5,7 +5,7 @@ using System.Security.Cryptography;
 using System.Text;
 using System.Threading;
 
-namespace Renci.SshNet.Common
+namespace Renci.SshNet
 {
     /// <summary>
     /// Collection of different extension method specific for .NET 3.5

src/Renci.SshNet/Common/Extensions.cs

@@ -7,10 +7,11 @@ using System.Net;
 using System.Net.Sockets;
 using System.Text;
 using Renci.SshNet.Abstractions;
+using Renci.SshNet.Common;
 using Renci.SshNet.Messages;
 using Renci.SshNet.Messages.Connection;
 
-namespace Renci.SshNet.Common
+namespace Renci.SshNet
 {
     /// <summary>
     /// Collection of different extension method